Found this when I had the water pump disassembled for a rebuild.
Water pump housing was leaking from the housing "snitch" hole. So needed new gaskets. Any way. Found a broken impeller drive shaft. Bought a used pump assembly through Ebay. Only need a new impeller drive shaft. The shafts are discontinued, so you need to find them used.. Any way, waiting for it to be delivered.
I also pulled the oil pan. Wanted to check the oil pump drive shaft. -Yes, the small c-clip was about half way out from the groove in the shaft. This was the reason I pulled the oil pan to check that the c-clip was still in place. I have put in an order for a new c-clip and gaskets. What I did notice was that in the parts tech drawing there are two washers behind the c-clip, but there was/is only one on the shaft. In the service manual, to my understanding, they only say washer, as in use one washer. So what is it, one or two washers? When I move the oil pump drive shaft, the shaft moves, to my opinion a bit to much, so that one could place two washers and still have free movement..
So question? - Put in two washers or just one as it was?
I did not find any trace of a broken washer in the oil pan, oil plug magnet or any where else in the engine.